Ash glazes have always been one of the leaders in cool Stoneware glaze effects. This is a gem of a series. Used alone, they'll replicate the look of reduction fired ash glazes, but overlapping Spectrum's 1100 series, you'll discover how easy it is to activate the surface of non-textured vertical surfaces. They get their effects by running, so test for the amount of glaze run and protect shelves with kiln wash. They're worth it!